J Adhes Dent. 2018;20(6):535-540. doi: 10.3290/j.jad.a41629.
To evaluate the effect of the chemical formulation of liners on the shear bond strength (SBS) between lithium disilicate veneering ceramic and zirconia core.
Four experimental groups (n = 12) were designed according to liner composition: negative control group (lithium and phosphorus removed from the conventional liner), Li group (lithium added to the negative control group), P group (phosphorus added to the negative control group), and Li+P group as the positive control (conventional liner). After applying the liner, lithium disilicate was pressed on zirconia. Specimens were stored in distilled water (37°C, 24 h) before testing the SBS. To test the SBS, shear force was applied perpendicular to the lithium disilicate-zirconia interface. The differences in the SBS between the veneer lithium disilicate and zirconia substructure were evaluated with one-way ANOVA (significance level of 0.05).
The presence or absence of lithium and phosphorus influenced the efficacy of the liner. The negative control and P groups showed mainly cohesive failures, and the Li group mainly showed mixed failures. Both adhesive and mixed failures were observed in the Li+P group. The groups including lithium showed significantly higher SBS than the negative control or Li+P group (p < 0.05). The group including phosphorus, which showed higher crystallinity, showed significantly lower SBS than the negative control and Li+P groups (p < 0.05).
The differences in the composition of the liner can affect the wettability and reactivity, and as a result, the SBS was different.
评估衬垫化学配方对二硅酸锂饰瓷与氧化锆基底间剪切结合强度（SBS）的影响。
根据衬垫成分设计了四个实验组（n=12）：阴性对照组（从常规衬垫中去除锂和磷）、Li 组（在阴性对照组中添加锂）、P 组（在阴性对照组中添加磷）和 Li+P 组作为阳性对照（常规衬垫）。在施加衬垫后，将二硅酸锂压在氧化锆上。将样品储存在蒸馏水中（37°C，24 h），然后进行 SBS 测试。为了测试 SBS，沿二硅酸锂-氧化锆界面垂直施加剪切力。采用单因素方差分析（显著性水平 0.05）评估饰层二硅酸锂与氧化锆基层之间 SBS 的差异。
锂和磷的存在或缺失影响了衬垫的效果。阴性对照组和 P 组主要表现为内聚性破坏，Li 组主要表现为混合性破坏。Li+P 组中观察到粘结性和混合性破坏。含有锂的组的 SBS 明显高于阴性对照组或 Li+P 组（p<0.05）。磷含量较高的组表现出明显较低的 SBS，低于阴性对照组和 Li+P 组（p<0.05）。
衬垫成分的差异会影响润湿性和反应性，从而导致 SBS 不同。
